Capture repositoryId from heroku (#25910)

* Capture repositoryId from heroku

* Add comments

packages/gatsby-telemetry/src/repository-id.ts

@@ -1,8 +1,11 @@
-import { createHash } from "crypto"
+import path from "path"
 import { basename } from "path"
+import { createHash } from "crypto"
 import { execSync } from "child_process"
-import gitUp from "git-up"
+import { readdirSync, readFileSync } from "fs"
 
+import gitUp from "git-up"
+import { getCIName } from "gatsby-core-utils"
 // there are no types for git-up, so we create our own
 // based on https://github.com/IonicaBizau/git-up/blob/60e6a4ff93d50360bbb80953bfab2f82d3418900/lib/index.js#L8-L28
 const typedGitUp = gitUp as (
@@ -31,7 +34,8 @@ export const getRepoMetadata = (url: string): IRepositoryData | null => {
     const res: IRepositoryData = { provider: hash(provider) }
 
     const userAndRepo = pathname.split(`/`)
-    if (userAndRepo.length == 3) {
+
+    if (userAndRepo.length >= 3) {
       res.owner = hash(userAndRepo[1])
       res.name = hash(userAndRepo[2].replace(`.git`, ``))
     }
@@ -83,8 +87,48 @@ const getRepositoryFromNetlifyEnv = (): IRepositoryId | null => {
   return null
 }
 
+function getRepositoryFromHerokuEnv(): IRepositoryId | null {
+  if (getCIName() !== `Heroku`) {
+    return null
+  }
+
+  // Parse repository metadata from /proc/*/environ. This is a naive glob approach to only
+  // look pids in procfs.
+  const proc = readdirSync(`/proc`).filter(dir => Number.isFinite(Number(dir)))
+  const len = proc.length
+  for (let i = 0; i < len; i++) {
+    const dir = proc[i]
+    try {
+      // Piggyback on internal datastructures for control processes to see the git repo info
+      const environData = readFileSync(path.join(`/proc`, dir, `environ`))
+        ?.toString(`utf8`)
+        ?.split(/\0/)
+        ?.find(e => e.indexOf(`RECEIVE_DATA`) >= 0)
+        ?.replace(`RECEIVE_DATA=`, ``)
+
+      if (!environData) {
+        continue
+      }
+      const data = JSON.parse(environData)
+      const url = data?.push_metadata?.source_url
+      if (url) {
+        return {
+          repositoryId: `heroku:${hash(url)}`,
+          repositoryData: getRepoMetadata(url),
+        }
+      }
+    } catch (e) {
+      // ignore
+    }
+  }
+  return null
+}
+
 export const getRepositoryId = (): IRepositoryId => {
-  const gitRepo = getGitRemoteWithGit() || getRepositoryFromNetlifyEnv()
+  const gitRepo =
+    getGitRemoteWithGit() ||
+    getRepositoryFromNetlifyEnv() ||
+    getRepositoryFromHerokuEnv()
   if (gitRepo) {
     return gitRepo
   } else {

packages/gatsby-telemetry/src/telemetry.ts

@@ -1,6 +1,5 @@
 import uuidV4 from "uuid/v4"
 import { isCI, getCIName } from "gatsby-core-utils"
-
 import {
   getRepositoryId as _getRepositoryId,
   IRepositoryId,